Consider a database name “interviewmania” whose attributes

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Consider a database name “interviewmania” whose attributes are internid (primary key), subject.
Internid = {1, 2, 3, 4, 5, 6}
Subject = {sql, oop, sql, oop, c, c++}
If these are one to one relation then what will be the output of the following query?
```
SELECT intern_id
FROM interviewmania
WHERE subject IN (c, c++);
```

1. {1, 2, 3}
2. {3, 4}
3. {5, 6}
4. All of above
5. None of these

Correct Option: C

Only those value whose subjects are c and c++.